<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    #p1{color: green}
    .p2{color: yellow}
    input[type='text'],body>p{background-color: red}
    body>div>div>p{color: pink}
    body div div p{background-color: yellow}
    a:link{color: green}
    a:visited{color: red}
    a:hover{color: yellow}
    a:active{color: pink}
  </style>
</head>
<body>
<ul>
  <li id="p1">刘备</li>
  <li>关羽</li>
  <li class="p2">张飞</li>
</ul>
  <p>香蕉</p><p class="p2">苹果</p>
  <input type="text">
  <input type="password">
  <div>
    <p>p1</p>
    <div><p>p2</p></div>
    <div><div><p>p3</p></div></div>
  </div>
  <a href="http://www.qq.com">腾讯官网</a>
</body>
</html>